Chemistry - GOC Question with Solution | TestHub

The conjugate bases Cl⁻, F⁻, Br⁻ and I⁻ are all in the same column, so size decides : I⁻ $>$ Br⁻ $>$ Cl⁻ $>$ F⁻ in stability, giving HF $<$ HCl $<$ HBr $<$ HI, i.e. 2, 1, 3, 4.